keymapper.conf

# define some aliases
Alt     = AltLeft
AltGr   = AltRight
Win     = Meta
Command = Meta

# immediately forward common modifier keys (also used as mouse modifiers)
@forward-modifiers Shift Control Alt

# define a virtual "boss" key, which can be toggled using the scroll-lock key
# when the boss key is "pressed", the keyboard should be intuitively useable
Boss = Virtual1
ScrollLock >> Boss

# add mappings in context which is active when boss key is not pressed
[modifier="!Boss"]
  # map Capslock to Backspace
  Control{CapsLock} >> CapsLock
  CapsLock          >> Backspace

  # define an additional modifier "Ext" (angular bracket key on some keyboards)
  Ext = IntlBackslash

  # the Ext modifier alone should have no effect
  Ext >>

  # map Ext-S/D/F to Alt/Shift/Control
  Ext{S}               >> Alt
  Ext{D}               >> Shift
  Ext{F}               >> Control
  Ext{A}               >> Alt   # also map A because of S/D rollover

  # Ext-W and the navigation keys should step in/out/over during debugging
  Ext{W{L}}            >> debug_step_into
  Ext{W{J}}            >> debug_step_out
  Ext{W{K}}            >> debug_step_over
  Ext{W{Any}}          >>

  # map Ext-I/J/K/L to cursor keys...
  Ext{I}               >> ArrowUp
  Ext{K}               >> ArrowDown
  Ext{J}               >> ArrowLeft
  Ext{L}               >> ArrowRight
  Ext{U}               >> cursor_home
  Ext{O}               >> cursor_end
  Ext{Y}               >> PageUp
  Ext{H}               >> PageDown

  Ext{Semicolon}       >> Backspace
  Ext{Q}               >> navigate_escape
  Ext{Space}           >> Space
  Ext{M}               >> Enter

  Ext{X}               >> edit_cut
  Ext{C}               >> edit_copy
  Ext{V}               >> edit_paste
  Ext{E}               >> Control{F}
  Ext{Z}               >> edit_undo
  (Ext Shift){Z}       >> edit_redo
  Ext{F}               >> find

  Ext{Comma}           >> navigate_back
  Ext{Period}          >> navigate_fore
  Ext{T}               >> open_file
  Ext{G}               >> go_to_definition
  Ext{BracketRight}    >> AudioVolumeUp
  Ext{BracketLeft}     >> AudioVolumeDown
  Ext{R}               >> Delete
  Ext{B}               >> build

  # map Ext-number keys to function keys
  Ext{1}               >> F1
  Ext{2}               >> edit_rename
  Ext{3}               >> F3
  Ext{4}               >> F4
  Ext{5}               >> F5
  Ext{6}               >> F6
  Ext{7}               >> F7
  Ext{8}               >> F8
  Ext{9}               >> F9
  Ext{0}               >> F10
  Ext{Minus}           >> F11
  Ext{Equal}           >> F12

  # the Ext modifier together with other keys should have no effect
  Ext{Any}             >>

  # add some Windows-key commands
  Win{C}               >> open_terminal
  Win{Q}               >> close_window
  Win{A}               >> lower_window
  Win{Tab}             >> next_tab
  (Win Shift){Tab}     >> prev_tab
  (Win Control Alt){S} >> suspend_machine
  (Win Control Alt){P} >> poweroff_machine
  (Win Control Alt){R} >> reboot_machine

  # pass other Windows key combinations unmapped
  Win{Any}             >> Win{Any}

  # colemak layout mapping
  (Shift AltGr){I}         >> 'Ü'
  AltGr{I}                 >> 'ü'
  (Shift AltGr){A}         >> 'Ä'
  AltGr{A}                 >> 'ä'
  (Shift AltGr){Semicolon} >> 'Ö'
  AltGr{Semicolon}         >> 'ö'
  AltGr{D}                 >> 'ß'
  AltGr{Q}                 >> '@'
  AltGr{Backquote}         >> '°'
  
  E                        >> F
  R                        >> P
  T                        >> G
  Y                        >> J
  U                        >> L
  I                        >> U
  O                        >> Z
  Z                        >> Y
  Shift{P}                 >> ':'
  P                        >> ';'
  S                        >> R
  D                        >> S
  F                        >> T
  G                        >> D
  J                        >> N
  K                        >> E
  L                        >> I
  Semicolon                >> O
  N                        >> K

  Shift{Quote}             >> '"'
  Quote                    >> "'"
  Shift{Comma}             >> '<'
  Shift{Period}            >> '>'
  Shift{BracketLeft}       >> '{'
  BracketLeft              >> '['
  Shift{BracketRight}      >> '}'
  BracketRight             >> ']'
  Shift{Backquote}         >> Shift{Equal} Space  # dead key '`'
  Backquote                >> '~'
  Shift{2}                 >> '@'
  Shift{3}                 >> '#'
  Shift{6}                 >> Backquote Space   # dead key '^'
  Shift{7}                 >> '&'
  Shift{8}                 >> '*'
  Shift{9}                 >> '('
  Shift{0}                 >> ')'
  Shift{Minus}             >> '_'
  Minus                    >> '-'
  Shift{Equal}             >> '+'
  Equal                    >> '='
  Shift{Backslash}         >> '|'
  Backslash                >> '\'
  Shift{Slash}             >> '?'
  Slash                    >> '/'

  # default mappings for abstract commands
  open_terminal        >> Any
  suspend_machine      >> Any
  poweroff_machine     >> Any
  reboot_machine       >> Any
  close_window         >> Alt{F4}
  navigate_escape      >> Escape
  cursor_home          >> Home
  cursor_end           >> End
  open_file            >> Control{O}
  navigate_back        >> Alt{ArrowLeft}
  navigate_fore        >> Alt{ArrowRight}
  next_tab             >> Control{PageUp}
  prev_tab             >> Control{PageDown}
  edit_copy            >> Control{C}
  edit_cut             >> Control{X}
  edit_paste           >> Control{V}
  edit_undo            >> Control{Y}
  edit_redo            >> Control{Z}
  find                 >> Control{F}
  build                >> Control{B}
  debug_step_over      >> F10
  debug_step_into      >> F11
  debug_step_out       >> Shift{F11}
  edit_rename          >> F2

# system/application specific mappings for abstract commands
[system="MacOS"]
  @macos-iso-keyboard
  close_window         >> Command{Q}
  cursor_home          >> Command{ArrowLeft}
  cursor_end           >> Command{ArrowRight}
  edit_cut             >> Command{X}
  edit_copy            >> Command{C}
  edit_paste           >> Command{V}
  edit_undo            >> Command{Y}
  edit_redo            >> (Command Shift){Y}
  find                 >> Command{F}

[system="Linux"]
  lower_window         >> (Alt Shift){PageDown}

[system="Linux" class="Thunar"]
  cursor_home          >> Backspace
  cursor_end           >> Enter
  open_terminal        >> (Shift Control){C}

[system="Linux" class="tilix"]
  close_window         >> (Shift Control){W}
  edit_paste           >> (Shift Control){V}
  open_terminal        >> ContextMenu ^ Enter

[system="Windows"]
  suspend_machine      >> Win{X} 300ms U S
  poweroff_machine     >> Win{X} 300ms U U
  reboot_machine       >> Win{X} 300ms U R
  lower_window         >> Alt{Escape}
  open_terminal        >> $(start cmd)

[system="Windows" class="CabinetWClass"] # Windows Explorer
  open_terminal        >> F4 ^ Control{A} "cmd" Enter

[title="Mozilla Firefox"]
  open_file            >> Control{K}
  navigate_escape      >> Escape Control{F} Escape
  go_to_definition     >> Shift{Backslash}

[title="Chromium"]
  open_file            >> Control{L}
  navigate_escape      >> Control{L} F6

[title="Qt Creator"]
  open_file            >> Control{K}
  go_to_definition     >> F2
  edit_redo            >> (Control Shift){Y}
  edit_rename          >> (Control Shift){R}

[title=/Code - OSS|Visual Studio Code/]
  go_to_definition     >> F12
  navigate_back        >> (Control Alt){Slash}
  navigate_fore        >> (Control Shift){Slash}
  build                >> (Control Shift){B}

[title="Visual Studio"]
  go_to_definition     >> F12
  navigate_back        >> Control{Slash}
  navigate_fore        >> (Control Shift){Slash}
  build                >> (Control Shift){B}

[title="Geany"]
  go_to_definition     >> (Control Shift){T}